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WASTE DISCHARGE REQUIREMENTS -17- FORWARD INC.,FORWARD LANDFILL SAM JOAQUIN COUNTY DRYING OPERATION SPECIFICATIONS 35. Sludges from water or wastewater treatment plants may be disposed of by spreading on a one foot thick, compacted clay pad that is bermed to prevent runoff. Sludges shall be handled in such a manner as to allow drying of the waste with no percolation of liquid or waste constituents through the bottom of the clay pad. Once the waste has dried, it and any soil it has contacted shall be moved to WMU D, or WMU H for disposal- The clay pad shall be rebuilt to its original thickness after each drying cycle. This operation may be done from May through October. WMU CLOSURE SPECIFICATIONS Landfill Closure 36. At closure, each landfill unit shall receive a final cover consisting, at a minimum, of a two- foot thick foundation layer which may contain waste materials, overlain by either a one- foot thick clay barrier layer or a GCL, and finally by a one-foot thick vegetative soil layer. For landfill its which have a composite liner system, the final cover shall include a flexible membrane component(synthetic liner or SL)placed between the barrier layer and the vegetative layer. 37. Vegetation shall be planted and maintained over each closed landfill unit. Vegetation shall be selected to require a minimum of irrigation and maintenance and shall have a rooting depth not in excess of the vegetative layer thickness. 38. Closed landfill units shall be graded to at least a three percent grade and maintained to prevent ponding. Surface Impoundment Closure 39. At closure of surface impoundments, all residual wastes, including liquids, sludges, precipitates, settled solids, and liner materials and adjacent natural geologic materials contaminated by wastes, shall be completely removed and discharged to a WMU approved by the Board. If after reasonable attempts to remove contaminated natural geologic materials, the Discharger demonstrates that removal of all remaining.contamination is infeasible, the impoundment shall be closed as a landfill pursuant to Chapter 15 and specifications 36 through 38 above.